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Finding the Fourth Proportional to 390,288.60, 584,558.10 and 320,304.60

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Solution

The fourth proportional to 390,288.60, 584,558.10 and 320,304.60 is: 479,738.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,288.60 : 584,558.10 = 320,304.60 : x
  2. Step 2: Convert to fraction form
    390,288.60/584,558.10 = 320,304.60/x
  3. Step 3: Cross multiply
    390,288.60x = 584,558.10 × 320,304.60
  4. Step 4: Simplify right side
    390,288.60x = 187,236,648,397.26
  5. Step 5: Solve for x
    x = 187,236,648,397.26/390,288.60
  6. Step 6: Final answer
    x = 479,738.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.